Endomorphisms of varieties and Bott vanishing

Tatsuro Kawakami; Burt Totaro

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arXiv · 2302.11921

Endomorphisms of varieties and Bott vanishing

Tatsuro Kawakami·Burt Totaro

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Abstract

We show that a projective variety with an int-amplified endomorphism of degree invertible in the base field satisfies Bott vanishing. This is a new way to analyze which varieties have nontrivial endomorphisms. In particular, we extend some classification results on varieties admitting endomorphisms (for Fano threefolds of Picard number one and several other cases) to any characteristic. The classification results in characteristic zero are due to Amerik-Rovinsky-Van de Ven, Hwang-Mok, Paranjape-Srinivas, Beauville, and Shao-Zhong. Our method also bounds the degree of morphisms into a given variety. Finally, we relate endomorphisms to global $F$-regularity.

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Tatsuro Kawakami, Burt Totaro. 2023-02-23. Endomorphisms of varieties and Bott vanishing. https://arxiv.org/abs/2302.11921

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